1st European Mechanics of Materials Conference on Local Approach to Fracture '86 - 96'
J. Phys. IV France 06 (1996) C6-145-C6-153
Application of Local Damage and Fracture Models to Notched Round Copper BarsT. Pardoen1, P. Delatte2, J. Morhet2, I. Doghri2, R. Knockaert2 and F. Delannay1
1 Université Catholique de Louvain, Département des Sciences des Matériaux et Procédés, PCIM, 2 Place Sainte-Barbe, 1348 Louvain-la-Neuve, Belgium
2 Université Catholique de Louvain, Département de Mécanique, MEMA, 4 avenue G. Lemaître, 1348 Louvain-la-Neuve, Belgium
The Rice & Tracey, damage work, and Lemaître & Chaboche models were investigated on cylindrical notched extruded copper bars. The values of the two constant factors appearing in the expression of the void growth rate in the Rice & Tracey model were reevaluated by combining experiments (porosity measurements and tensile tests) and numerical computations of uniaxial tensile tests and of tensile tests on notched round bars. The values of the critical void growth rates (Beremin approach) and critical damage works were found to be independent on triaxiality. The application of the Lemaître & Chaboche model allows to predict the softening appearing at initiation for lower triaxialities. Difficulties were encountered to physically identify the parameters of the model.
© EDP Sciences 1996